Main material: 4#,Zinc Alloy, Copper CylinderFinish: Nano Spray(ADB black, matte, off-white, etc.)Chrome, Black, etc. Process.Function and use: For the toolbox, filing cabinets, boxes and other instruments. Rotated through 90°on the key to open, lock and switch locking tabs around can be achieved the right and left turn capabilites.